Technische Informationen zu Nexus und Alfine Drei-, Vier-, Sieben-, Acht- und Elf-Gang-Naben: Unterschied zwischen den Versionen

The motor unit for a hub with electrical shifting is installed with both the hub and the motor unit in first-gear position. Dots at the right end of the hub should be aligned as shown. Shimano has a special tool to align them, but this can also be achieved with careful clockwise rotation of the two notches in the ring shown in gray, using an adjustable pin spanner.

The tabs in the motor unit should be aligned as shown in the next picture. If they are not, use the electrical shifter to shift the motor unit to first-gear position. There should be a rubber sealing ring just inside the indentation in the inner face of the motor unit. Install it if necessary. The smaller-diameter side faces inward.

The motor unit can install either of two ways. Either way is OK: you will rotate the axle when installing the wheel so the electrical connection faces forward. Place the motor unit over the end of the axle so that marks on it line up with marks on a spacer inboard of locknut B, as shown in the image below. Rotate the motor unit clockwise to engage it with the axle assembly, and install locknut B, which secures the motor unit. (Note: in at least one dealer manual, DM-S7051-02-ENG-1.pdf, labels for inner and outer locknuts are switched.) The legend for the drawing in the manual reads:

Yow! Installation of this hub is already complicated enough! The labels are corrected in the image below.)

==Zugmontage==